WEX

Senior Java Engineer (Fleet/Payments)

WEX
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6 days ago
Remote, Americas or São Paulo, BrazilSenior
H1B Sponsor

Responsibilities

  • Design, develop, and maintain robust, scalable, high-performance backend services.
  • Develop public REST APIs with Java and internal gRPC APIs for inter-service communication.
  • Create system designs, lead design decisions, and align with senior engineers and cross-functional teams.
  • Write unit, integration, end-to-end, concurrency, load, and performance tests.
  • Identify bottlenecks and technical debt and implement scalability, stability, monitoring, healing, and scaling improvements.
  • Implement continuous integration and deployment automation to reduce time to market.
  • Collaborate with product managers, designers, and engineers to define and implement features.
  • Conduct code reviews, mentor junior and mid-level engineers, and promote engineering best practices.
  • Troubleshoot complex production issues, author root cause analyses, and drive lasting reliability improvements.
  • Evaluate competing technologies and advise on technology solutions.
  • Maintain design documents, run books, change management documents, and readiness plans.
  • Provide live-site support, monitor production applications, resolve incidents, and drive continuous improvement.
  • Lead cross-team projects as a single-threaded owner or technical lead and unblock other engineers.

Requirements

  • Bachelor’s degree in Computer Science or Software Engineering.
  • Senior software engineering experience.
  • Strong understanding of data structures, algorithms, object-oriented design, and problem solving.
  • Expertise designing and developing internet-scale services with scalability, availability, security, and reliability considerations.
  • Proficiency in backend development with Java or C#, Spring Boot, RESTful APIs, ODATA, and SQL.
  • Ability to use AI-enabled development tools such as Cursor AI, Kiro, and GitHub Copilot.
  • Excellent written and verbal communication skills and a collaborative, empathetic mindset.
  • Fluent English.
  • Preferred: Master’s degree in computer science or software engineering.
  • Preferred: Experience with event-driven architecture, Kafka, card payments, cloud-native architecture, Docker, and Kubernetes.
  • Preferred: Awareness of API security and PCI DSS compliance requirements.
  • Preferred: Familiarity with iOS or Android development.
  • Preferred: Experience building and deploying AI solutions, production-grade AI agents or copilots, and multi-agent or distributed AI architectures.
  • Preferred: Experience with vector databases such as Pinecone, Weaviate, OpenSearch, or Milvus.
  • Preferred: Knowledge of AI evaluation techniques, safety practices, and responsible AI principles.

Tech Stack

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WEX

About WEX

5,001-10,000 employees

WEX (NYSE: WEX) is the global commerce platform that simplifies the business of running a business. WEX has created a powerful ecosystem that offers seamlessly embedded, personalized solutions for its customers around the world. Through its rich data and specialized expertise in simplifying benefits, reimagining mobility and paying and getting paid, WEX aims to make it easy for companies to overcome complexity and reach their full potential. For more information, please visit www.wexinc.com.

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